13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

A bright gamma-ray flare from the blazar B2 1215+30 detected by VERITAS and Fermi-LAT

15 Dec 2015, 15:03
Level 0, Room 4 (International Conference Centre Geneva)

Level 0, Room 4

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Floriana Zefi (LLR - Ecole Polytechnique)


We report on evidence of simultaneous gamma-ray flaring from the BL Lac source B2 1215+30, detected by VERITAS (E > 100 GeV) and the Fermi Large Area Telescope (100 MeV < E <100 GeV). The source was observed by VERITAS during an exceptional flaring state in 2014 February 08. Investigations of flux variability in the energy range covered by Fermi-LAT, show that the GeV flare occurred contemporaneously with the TeV flare. From the variability time scale we constrain the size of the emission region and derive a limit on the Doppler factor of the relativistic jet of B2 1215+30.

Primary author

Floriana Zefi (LLR - Ecole Polytechnique)


Prof. Reshmi Mukherjee (Barnard College, New York) Dr Stephen Fegan (LLR-Ecole Polytechnique)

Presentation Materials